FW: [ATM] make ronchi grating

[mlbrown at everstrive.com (mlbrown@everstrive.com)]

Naw, make your own:

Search the archives (http://astro.umsystem.edu/atm/search.html) for "make
ronchi grating" and you get (amongst many):

http://astro.umsystem.edu/atm/ARCHIVES/JUN97/msg00266.html

For postscript code you can use to print your own gratings on
transparencies.  Works a treat for me.  I use 133 lpi.

If you look thru the archives, you'll also see several ways to make your
own, wrapping fine wire or monofilament around a simple frame.

Also try to Google "make ronchi grating" and you'll find:

http://telescopemaking.org/ronchi.html

=Matt

Original Message:
-----------------
From: c f quantemlp@hotmail.com
Date: Mon, 26 Jan 2004 21:07:11 +0000
To: atm@atmlist.net
Subject: [ATM] ronchi grating


Hello to all,

I have started to polish my mirror, and I have built my knife edge/ronchi 
tester.  the only thing I am missing is the ronchi grate.  I have seen in 
the atm boards that this has been bought at orion, and edmonds,  I checked 
edmonds and they wanted $37 for it,  and newport glass wanted over $20 for 
thiers also.  but the prices I have seen on the boards are all around $6.  
is it possible to make this grating with the computer with success?  or is 
there a web site that I can order this from.  I have ordered the orion 
catalog and will check in there also when it comes in.  I can do the knife 
edge test and wire test with no issues, but I would like to follow up with 
the ronchi.  If anybody has any knowledge of where I can get this grating 
please let me know.  If there is a way to make it and have it done 
correctly, please let me know also.

clear skys to all

charles in wilmington

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